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01/23/08 1:53 PM ET

Another Twins ballpark milestone reached on Wednesday

MINNEAPOLIS -- The Minnesota Twins, Minnesota Ballpark Authority and Mortenson Construction announced on Wednesday that another important milestone at the site of the new ballpark. The first main concourse concrete pour was conducted this morning along the 7th Street bridge side of the site.

There will be approximately 58 deck pours at the Twins ballpark site between now and March 2009 forming the various floors throughout the ballpark. Concrete is also being used for the ballpark's foundation, columns and walls up to and including the upper concourse. A total of 55,000 cubic yards of concrete will be poured in the ballpark, equivalent to a six-foot wide sidewalk from Minneapolis to Duluth (140 miles).

"This milestone marks the beginning of an exciting phase in the construction of the Twins ballpark," said Dan Mehls, Mortenson Construction executive. "What we've begun this week marks areas where pedestrians and fans will actually walk to access the gates to the new facility."

The concrete crew at the Twins ballpark will range from 15 to 20 workers. Subcontractors involved in the concrete work include CECO Concrete Construction, E&J Rebar, Ambassador Steel Corporation, AMSYSCO, and Nordic Construction/Cemstone.

The concrete mix consists of water, cement, aggregate, admixtures, and fl y-ash (a by product of coal burning plants that improves workability, durability and has environmental benefits). To prevent the water in the concrete from freezing in cold weather, the space below the slab being poured is enclosed with plastic and heated to about 90 degrees. After the concrete is placed and finished, construction blankets are put on top to contain the heat and allow the concrete to cure. The concrete compressive strength is 7,000 pound force per square inch (psi). Residential concrete is 2,500 psi.

"It is exciting to see this work progress through the sub-zero weather in order to keep the project on time and on budget," said Kevin Smith, Minnesota Twins executive director of public affairs. "We are proud to have such a dedicated and hard working crew on site to not only get this important work underway, but to continue construction on all other facets of the project."

Additionally, more than 2,000 of the approximately 3,000 piles have been driven on the site. That means two-thirds of that work is complete and should be finished in a couple of months.

For the latest news and information about the Twins ballpark, please visit www.twinsbaseball.com/newballpark .

This story was not subject to the approval of Major League Baseball or its clubs.